The Homebrew is a package manager for MacOS or Linux. It installs packages to their own directory and then symlinks into /usr/local. Homebrew formulae are Ruby scripts.

The vert.x is a tool-kit for building async applications on the JVM. Vert.x has a set of coure functions and a set of extensions for high level functions. The Vert.x core APIs are implemented in multiple languages including Scala. Vert.x-Web is a set of constructs for building web applications. Both the core and the web are embeddable.

The Blindsight is a scala logging API based on SLF4J API, Logback and logstach logback encoder. It delegates logging to the SLF4J API and doesn’t configure or manage the SFL4J implementation. It use macro to get the source code information and support cross-thread context.

The scala-logging is a convenient logging library warpping slf4j logging API.

Cask code analysis for data marshalling. It covers the general data mechanism and the JSON data marshalling. Use def scalacOptions = Seq("-Xprint:typer") to see the implicit converters being applied.

Cask macros code analysis covers the macros implementation and related data types. To debug Macro AST, use def scalacOptions = Seq("-Ymacro-debug-lite") to inpsect generated code.

The blog Standardizing IO Interfaces for Scala Libraries describes the design of two standard interfaces: Writable and Readable. It is implemented in the Geny Library.